diff --git a/src/Stravaig.ShortCode.Tests/Stravaig.ShortCode.Tests.csproj b/src/Stravaig.ShortCode.Tests/Stravaig.ShortCode.Tests.csproj
index 3aa0914..7a18a60 100644
--- a/src/Stravaig.ShortCode.Tests/Stravaig.ShortCode.Tests.csproj
+++ b/src/Stravaig.ShortCode.Tests/Stravaig.ShortCode.Tests.csproj
@@ -7,7 +7,7 @@
     <ItemGroup>
       <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
       <PackageReference Include="Moq" Version="[4.18.4]" />
-      <PackageReference Include="NUnit" Version="3.14.0" />
+      <PackageReference Include="NUnit" Version="4.0.0" />
       <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
       <PackageReference Include="Shouldly" Version="4.2.1" />
       <PackageReference Include="Stravaig.Extensions.Logging.Diagnostics" Version="2.2.0" />